1 /* $NetBSD: netbsd32_machdep_16.c,v 1.8 2023/12/20 06:36:01 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Frank van der Linden for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: netbsd32_machdep_16.c,v 1.8 2023/12/20 06:36:01 thorpej Exp $"); 40 41 #ifdef _KERNEL_OPT 42 #include "opt_compat_netbsd.h" 43 #include "opt_execfmt.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/exec.h> 48 #include <sys/exec_aout.h> 49 #include <sys/kmem.h> 50 #include <sys/proc.h> 51 #include <sys/signalvar.h> 52 #include <sys/systm.h> 53 #include <sys/core.h> 54 #include <sys/mount.h> 55 #include <sys/buf.h> 56 #include <sys/vnode.h> 57 #include <sys/ras.h> 58 #include <sys/ptrace.h> 59 #include <sys/kauth.h> 60 #include <sys/module_hook.h> 61 62 #include <x86/fpu.h> 63 #include <x86/dbregs.h> 64 #include <machine/frame.h> 65 #include <machine/reg.h> 66 #include <machine/vmparam.h> 67 #include <machine/netbsd32_machdep.h> 68 #include <machine/sysarch.h> 69 #include <machine/userret.h> 70 71 #include <compat/netbsd32/netbsd32.h> 72 #include <compat/netbsd32/netbsd32_exec.h> 73 #include <compat/netbsd32/netbsd32_syscallargs.h> 74 75 #include <compat/sys/signal.h> 76 #include <compat/sys/signalvar.h> 77 78 void netbsd32_buildcontext(struct lwp *, struct trapframe *, void *, 79 sig_t, int); 80 81 int check_sigcontext32(struct lwp *, const struct netbsd32_sigcontext *); 82 83 static void 84 netbsd32_sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask) 85 { 86 struct lwp *l = curlwp; 87 struct proc *p = l->l_proc; 88 struct trapframe *tf; 89 int sig = ksi->ksi_signo; 90 sig_t catcher = SIGACTION(p, sig).sa_handler; 91 struct netbsd32_sigframe_sigcontext *fp, frame; 92 int onstack, error; 93 struct sigacts *ps = p->p_sigacts; 94 95 tf = l->l_md.md_regs; 96 97 /* Do we need to jump onto the signal stack? */ 98 onstack = 99 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 100 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 101 102 /* Allocate space for the signal handler context. */ 103 if (onstack) 104 fp = (struct netbsd32_sigframe_sigcontext *) 105 ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); 106 else 107 fp = (struct netbsd32_sigframe_sigcontext *)tf->tf_rsp; 108 fp--; 109 110 memset(&frame, 0, sizeof(frame)); 111 112 /* Build stack frame for signal trampoline. */ 113 switch (ps->sa_sigdesc[sig].sd_vers) { 114 case __SIGTRAMP_SIGCODE_VERSION: 115 frame.sf_ra = (uint32_t)(u_long)p->p_sigctx.ps_sigcode; 116 break; 117 case __SIGTRAMP_SIGCONTEXT_VERSION: 118 frame.sf_ra = (uint32_t)(u_long)ps->sa_sigdesc[sig].sd_tramp; 119 break; 120 default: 121 /* Don't know what trampoline version; kill it. */ 122 sigexit(l, SIGILL); 123 } 124 frame.sf_signum = sig; 125 frame.sf_code = ksi->ksi_trap; 126 frame.sf_scp = (uint32_t)(u_long)&fp->sf_sc; 127 128 frame.sf_sc.sc_ds = tf->tf_ds & 0xFFFF; 129 frame.sf_sc.sc_es = tf->tf_es & 0xFFFF; 130 frame.sf_sc.sc_fs = tf->tf_fs & 0xFFFF; 131 frame.sf_sc.sc_gs = tf->tf_gs & 0xFFFF; 132 133 frame.sf_sc.sc_eflags = tf->tf_rflags; 134 frame.sf_sc.sc_edi = tf->tf_rdi; 135 frame.sf_sc.sc_esi = tf->tf_rsi; 136 frame.sf_sc.sc_ebp = tf->tf_rbp; 137 frame.sf_sc.sc_ebx = tf->tf_rbx; 138 frame.sf_sc.sc_edx = tf->tf_rdx; 139 frame.sf_sc.sc_ecx = tf->tf_rcx; 140 frame.sf_sc.sc_eax = tf->tf_rax; 141 frame.sf_sc.sc_eip = tf->tf_rip; 142 frame.sf_sc.sc_cs = tf->tf_cs & 0xFFFF; 143 frame.sf_sc.sc_esp = tf->tf_rsp; 144 frame.sf_sc.sc_ss = tf->tf_ss & 0xFFFF; 145 frame.sf_sc.sc_trapno = tf->tf_trapno; 146 frame.sf_sc.sc_err = tf->tf_err; 147 148 /* Save signal stack. */ 149 frame.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; 150 151 /* Save signal mask. */ 152 frame.sf_sc.sc_mask = *mask; 153 154 sendsig_reset(l, sig); 155 156 mutex_exit(p->p_lock); 157 error = copyout(&frame, fp, sizeof(frame)); 158 mutex_enter(p->p_lock); 159 160 if (error != 0) { 161 /* 162 * Process has trashed its stack; give it an illegal 163 * instruction to halt it in its tracks. 164 */ 165 sigexit(l, SIGILL); 166 /* NOTREACHED */ 167 } 168 169 netbsd32_buildcontext(l, tf, fp, catcher, onstack); 170 } 171 172 int 173 compat_16_netbsd32___sigreturn14(struct lwp *l, 174 const struct compat_16_netbsd32___sigreturn14_args *uap, 175 register_t *retval) 176 { 177 /* { 178 syscallarg(netbsd32_sigcontextp_t) sigcntxp; 179 } */ 180 struct netbsd32_sigcontext *scp, context; 181 struct proc *p = l->l_proc; 182 struct trapframe *tf; 183 int error; 184 185 /* 186 * The trampoline code hands us the context. 187 * It is unsafe to keep track of it ourselves, in the event that a 188 * program jumps out of a signal handler. 189 */ 190 scp = NETBSD32PTR64(SCARG(uap, sigcntxp)); 191 if (copyin(scp, &context, sizeof(*scp)) != 0) 192 return (EFAULT); 193 194 /* 195 * Check for security violations. 196 */ 197 error = check_sigcontext32(l, &context); 198 if (error != 0) 199 return error; 200 201 /* Restore register context. */ 202 tf = l->l_md.md_regs; 203 tf->tf_ds = context.sc_ds & 0xFFFF; 204 tf->tf_es = context.sc_es & 0xFFFF; 205 cpu_fsgs_reload(l, context.sc_fs, context.sc_gs); 206 tf->tf_rflags = context.sc_eflags; 207 tf->tf_rdi = context.sc_edi; 208 tf->tf_rsi = context.sc_esi; 209 tf->tf_rbp = context.sc_ebp; 210 tf->tf_rbx = context.sc_ebx; 211 tf->tf_rdx = context.sc_edx; 212 tf->tf_rcx = context.sc_ecx; 213 tf->tf_rax = context.sc_eax; 214 215 tf->tf_rip = context.sc_eip; 216 tf->tf_cs = context.sc_cs & 0xFFFF; 217 tf->tf_rsp = context.sc_esp; 218 tf->tf_ss = context.sc_ss & 0xFFFF; 219 220 mutex_enter(p->p_lock); 221 /* Restore signal stack. */ 222 if (context.sc_onstack & SS_ONSTACK) 223 l->l_sigstk.ss_flags |= SS_ONSTACK; 224 else 225 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 226 /* Restore signal mask. */ 227 (void) sigprocmask1(l, SIG_SETMASK, &context.sc_mask, 0); 228 mutex_exit(p->p_lock); 229 230 return (EJUSTRETURN); 231 } 232 233 void 234 netbsd32_machdep_md_16_init(void) 235 { 236 237 MODULE_HOOK_SET(netbsd32_sendsig_sigcontext_16_hook, 238 netbsd32_sendsig_sigcontext); 239 } 240 241 void 242 netbsd32_machdep_md_16_fini(void) 243 { 244 245 MODULE_HOOK_UNSET(netbsd32_sendsig_sigcontext_16_hook); 246 } 247
Indexes created Sun Oct 25 00:26:45 UTC 2026